ls - Shows list.
- -a - Hidden file.
- -l - Persmission.
- -R - Show sub dir.

mkdir <new-dir-name> - Create a new folder.
mkdir -p test/test1/test2 - Craete a dir between two directories.
touch <new-file-name> - create a blank file.
pwd - Present working directory.
cat <filename> - Display file content.
cat > <new-file-name> - Create a file.
dd if=/dev/zero of=bos_dosya bs=4G count=1- create empty file with zeros
cat >> <filename> - Append the file.
cat <filename> <filename2> - Display 2 files at a time.
cat <filename> <filename2> > <newfile-name> - Merge both of file content in a single one.
cat <file-name> | tr > <new-file-name> - Translate the file.
cut -c 1-2 <filename> - cut the file with colum wise
echo "Hello" >> <file-name>

cp <file-name> <new-fie-name> - Make a copy of a file in the current location.
mv <file-name> <dir-path> - Move a file from a one dir to a another.
mv <file-name> <new-fie-name> - Rename a file.
mv -R <dir-name> <dir-path> - Move Dir
rm <file-name> - Remove a file
rm -R <file-name> - Delete a folder with dir included.
head <file-name> - Will display first 10 lines of a file.
tail <file-name> - Will display last 10 lines of a file. --n 2 - will display last 2 lines.
diff <file-1> <file-2> - Show diff between the two files.
locate <file> - To find out the file.
find <file/folder-name> - Find a file/folder.
find <dir-name> - Find files inside the dir
find .-type d - Show only dir.
- .-type f -Sshow only files.
- .-type f -name "*.txt" - Show only files with that specfic name.
- .-type f -iname "*.txt" - Show only files with that specfic name - not case sentive (i)
- .-type f -mmin -20 - Show files which modify less than 20 min ago.
- .-type f -mmin +20 - show files which modify more than 20 min ago.
- .-type f -maxdepth 2 - Will only show 1 folder deep.
- .-size +1k - will only show file/folder with size of 1kb

ps aux - processes which are running
df - Check the capacity and storage details.
- m - In megabyte) or
- hg - (gigabyte).
du - Disk usages capcity
- -h (human readable)
echo - Get a output of a string
echo $PATH - Check the path varibale
sudo - Admin command
sudo chown root text.txt - chnage owner
!<command-name> - Run the pevious command
git add .; git commit -m "message" - Run mutiple commands at a time
sort <file-name>" - sort the file
job
wget <url> - download the file from the URL
top - what processes are running
kill <process-id> -stop that process
Uname -
zip <file-1> <file-2> - Zip Two or more files
Unzip <file-name> - Unzip files
useradd <name>
passwd <name>
uname -<flag> -o -m -r
lscpu - get cpu details
free - free memory
vmstat - virtual memory
lsof - list all the open file
xdg-open <file-fath> - open the folder (graphical window) of a file/folder with path.
xdg-open . - open the folder of the current directory.
vi ~/.bashrc - set your Alias
echo -n 'username' | base64

chmod u=rwx,g=rxw,o=rwx <file-name> READ, WRITE AND EXECUTE
chmod 777 <file-name> - 4- Read, 2- Write, 1 - Execute
find . -perm 777 - will only show file/folder with size of 1kb
grep <keyword> <file-name> - To search if the keyword is presnt in the file or not
grep -w <keyword> <file-name> - To search if the keyword is presnt in the file or not (complete word)
grep -i <keyword> <file-name> - To search if the keyword is presnt in the file or not (not case sens)
grep -n <keyword> <file-name> - To search if the keyword is presnt in the file or not (Line number)
grep -B <keyword> <file-name> - Show Line before that keyword
grep -win <keyword> ./*.txt - To search if the keyword is presnt in the file in current dir
grep -win -r <keyword> .*
history | grep "ls -l" - Pipping, we filter out the things

histroy
!<number-from-history>

Operators

ping google.com & pingfacebook.com
echo "google.com" && echo "facebook.com" - second will oly run if first is sucessful
echo "google.com" && {echo "facebook.com"; eco "pradumnasaraf.co"}
echo "google.com" || echo "pingfacebook.com"
echo "google.com" || echo "pingfacebook.com"
rm -r !(file.txt)
printevnv - to print all th env.

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